[Comparative characteristics of respiratory and circulatory changes in acutely hyperthermic cats].
During three-hour heating, cats revealed two phases of changes in respiratory and circulatory systems: the compensatory phase corresponding to a moderate hyperthermia (rectal temperature 39.4 +/- 0.17 degrees C) and the decompensatory one developing at rectal temperature over 39.9 +/- 0.15 degrees C. In the first phase the alveolar ventilation, oxygen consumption, excretion of CO2 and one-minute respiratory volume increase to the same extent as the one-minute blood volume, the increased metabolism and heat production occurring against the background of the blood acid-alkaline homeostasis. In the second phase an imbalance of functions of respiratory and circulatory systems occurs leading to a decrease in the one-minute blood volume, an increase in the alveolar ventilation-lung blood flow ratio, a sharp drop of the pulmonary gas exchange and a respiratory alkalosis.
D000818:Animals; D001794:Blood Pressure; D001831:Body Temperature; D002245:Carbon Dioxide / Q000097:blood; D002302:Cardiac Output; D002415:Cats; D005334:Fever / Q000503:physiopathology*; D006339:Heart Rate; D006439:Hemodynamics; D010101:Oxygen Consumption; D012119:Respiration; D014692:Ventilation-Perfusion Ratio
D002245:Carbon Dioxide
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